* {
  margin: 0;
  padding: 0;
  box-sizing: border-box;
}
body {
  background-color: skyblue;
}
.header {
  height: 1rem;
  background-color: pink;
  margin: 0 0.125rem;
}
.header h2 {
  padding-top: 0.25rem;
  color: white;
  text-align: center;
}
.mainbox {
  display: flex;
  margin: 0.125rem;
}
.mainbox .column {
  position: relative;
  flex: 3;
  margin: 0.125rem;
}
.mainbox .column:nth-child(2) {
  flex: 5;
}
.mainbox .column .chart {
  margin-bottom: 0.125rem;
  height: 3.75rem;
  background-color: pink;
}
.mainbox .column .model {
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  width: 10rem;
  height: 10rem;
}
